Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2006"

TL;DR: The Global Ionosphere-thermosphere model (GITM) as mentioned in this paper uses a three-dimensional spherical grid that can be stretched in both latitude and altitude, while having a fixed resolution in longitude.

TL;DR: In this article, a brief overview of effects on the ionosphere of upward propagating waves from lower-lying regions is given, separately for the lower ionosphere, for the E-region ionosphere.

TL;DR: In this article, the effect of variations of the atmospheric forcing variables like temperature, humidity, and turbulent transport is assessed using the community aerosol and radiation model for atmospheres (CARMA), and simulated ice particle size distributions are analyzed applying Mie scattering calculations.

TL;DR: In this article, the effect of gravity wave (GW) forcing on the lower atmosphere has been investigated and it was shown that GW sources reflect the significant spatial and temporal variability of normal meteorological processes, such as wind and temperature fields through which they propagate.

TL;DR: The THEMIS project as mentioned in this paper is a NASA MIDEX mission scheduled for launch in 2006, which consists of five magnetospheric satellites in equatorial orbits, three of which will have apogees around 12 Re, while the fourth and fifth will have Apogee at ∼ 20 and ∼ 30 Re.

TL;DR: The search for links between F-region phenomena and the lower atmosphere has a long history and few real outcomes as mentioned in this paper have been found, and the only real outcomes that are known are those that are in the sense that events in lower atmosphere or in the Earth itself affect the F region, not the other way round.

TL;DR: In this paper, a joint analysis of one carefully selected dataset was performed by six teams, which used different approaches to trend determination, and the results showed that the trends in foF2 are very small, of the order of −0.01 MHz/year, much smaller than the solar cycle effect and therefore sensitive to the solar activity correction.

TL;DR: In this article, a new methodology of ionosonde height-time-intensity (HTI) analysis is introduced which allows the investigation of sporadic E layer (E s ) vertical motion and variability.

TL;DR: In this article, the global spectral mesosphere/lower thermosphere model (SMLTM) was used to simulate the greenhouse effect in the middle and upper atmosphere, where the ozone depletion has a profound cooling effect on mesospheric temperatures, which is comparable to or exceeding that of the CO 2 forcing.

TL;DR: In this paper, satellite observations of polar mesospheric clouds (PMCs) are extremely valuable because they typically have daily coverage to characterize seasonal variations, sufficient detections for each season to give good statistics, quantitative information for physical analysis, and coverage of both hemispheres to evaluate global behavior.

TL;DR: In this article, the authors examined the variability in polar mesospheric clouds (PMCs), temperature, and water vapor over decadal time scales and also between hemispheres using measurements from the Halogen Occultation Experiment (HALOE) covering 1991 to present.

TL;DR: In this article, the authors used the SABER instrument aboard the TIMED satellite during the first three years of the spacecraft mission (2002-2004) to better interpret the observations, the NCAR thermosphere-ionosphere-mesosphere-electrodynamics general circulation model (TIME-GCM) simulation of year 2003 is used for comparative analysis.

TL;DR: In this paper, the authors retrieved from infrared emission limb soundings taken by the CRISTA instrument in August 1997 and by the SABER instrument in 2003, and the data agree semi-quantitatively in their salient features and only small deviations due to the different meteorological conditions in the two years are observed.

TL;DR: In this paper, the effects of tidal and gravity waves at mesospheric and thermospheric heights and their control of ionospheric densities, electric fields and currents are relatively better known than those originating from vertical coupling due to planetary waves.

TL;DR: In this paper, a photochemical flow reactor was used to generate meteoric smoke mimics using appropriate photolytic precursors of Fe and Si atoms in an excess of oxidant.

TL;DR: In this article, the authors used the measurements of the Jicamarca digisonde to examine the variations in F2 layer peak electron density (NmF2), its height (hmF2) and the thickness parameter (B0) near the dip equator.

TL;DR: A review of the imaging of low-latitude irregularity processes conducted over the past 30 years is presented in this paper, where the signature in optical data of the Rayleigh-Taylor instability (RTI) process is the development of a region of depleted emission that typically shows east-west dimensions of 50 to several hundred kilometers.

TL;DR: In this article, the mesosphere/lower thermosphere winds were investigated using updated multi-year ground-based data obtained at three mid-latitude stations located at Collm (Germany), Obninsk (Russia) and Saskatoon (Canada).

TL;DR: Based on zonally averaged TIDI meridional wind data from one yaw period (March 19-May 19, 2004) near equinox, the authors examined the latitudinal and altitudinal distribution of the migrating diurnal and semidiurnal tides using least-squares fitting method to provide a global view of these tidal waves.

TL;DR: In this paper, a series of empirical relations between the far-field acoustic signature of the bolide shocks and meteor source energies by correlating infrasonic observations of those fireballs which are also detected by earth-observing satellites are presented.

TL;DR: In this paper, an observational, theoretical and modelling studies of interest of interest are outlined, and some observational and theoretical studies of the effects of electrical and magnetic field changes in different parts of the global atmospheric electrical circuit are discussed.

TL;DR: In this article, a new method of retrieving the top-side ionospheric scale height based on radio occultation observations onboard low-earth-orbiting satellites is presented. But the knowledge of the scale height in the ionosphere region remains rather poor due to the insufficient observations carried so far.

TL;DR: In this article, the current state of the global Fabry-Perot interferometer network is reviewed and several new and important science goals are discussed, as well as the potential for interesting science and significant application.

TL;DR: In this article, the authors describe the use of the neural network (NN) technique for the development of a near-real time global foF2 (NRTNN) empirical model.

TL;DR: In this article, the seasonal, longitudinal, and altitudinal variations of the F -region morphology at 2100-2300-LT in the low and middle-latitudes using the data collected in August, September, and November of 2003 were investigated using in situ measurements of the O + fraction and total ion density by the Defense Meteorological Satellite Program (DMSP) F15 satellite.

TL;DR: The structure of the radio refractive index in altitudes of the first 100m of the troposphere is important for the planning and design of microwave communication links as mentioned in this paper, and measurements of atmospheric pressure, temperature, and relative humidity were conducted in Akure “(7.15°N, 5.12°E)

TL;DR: In this paper, the spatial distribution of electron number density perturbations in the bottom ionosphere due to the appearance of external electric current in the near-earth atmosphere is analyzed.

TL;DR: In this article, the mean features of (P)MWE at polar and mid-latitudes were determined using VHF radar measurements between September and April at Andenes (2001-2005) and Kuhlungsborn (2003-2005).

TL;DR: In this article, the spectral aerosol optical depths as well as the Angstrom parameters were derived using the least-squares method applied to measured spectral irradiance data, and the errors associated with the turbidity coefficient, β, were found to be 0.0029 on average and with the wavelength exponent, α, 0.031.

TL;DR: In this paper, a wavelet-based detection and characterisation of the propagation of acoustic-gravity waves induced in the ionosphere by the solar eclipse of August 11, 1999 is presented.